| oncomelania hupensis quadrasi from mindoro (victoria), leyte (palo), and mindanao (davao del norte) of the philippines: susceptibility to infection with philippine isolates of schistosoma japonicum. | | 1977 | 592045 |
| the determination of the oncomelania hupensis quadrasi population density using the banana leaf method in four municipalities of eastern leyte, philippines. | | 1977 | 903267 |
| studies on the laboratory breeding and infectivity of oncomelania hupensis quadrasi. | | 1977 | 903268 |
| new oncomelania hupensis foci on taiwan. | six new areas for oncomelania hupensis were found on taiwan: three in nan-tou, and 1 each in chia-i, hua-lien and tai-tung counties. most of the new habitats, unlike previously known areas, are not in alluvial plains, but are at higher elevations. the nan-shan-chi colony in nan-tou county is located at the altitude of 740 m, which is the highest of all known oncomelania localities on the island. oncomelania has now been found in 9 out of 15 counties on taiwan. shell features of the newly-discove ... | 1976 | 957040 |
| prevalence and distribution of schistosomiasis in indonesia: a review. | the prevalence and distribution of schistosomiasis in indonesia is given, with the emphasis on the current data. an extensive investigation was started in 1971. control measures became desirable because of development schemes in and around the endemic areas, thus increasing the possibility of the spread of the infection. this investigation consisted of: a study of prevalence, distribution, and intensity of the infection in man and animals; clinical studies, treatment and follow-up; and epidemiol ... | 1976 | 1030833 |
| preliminary observations on the biology of the indonesian strain of schistosoma japonicum: animals and oncomelanid snails. | laboratory animals and subspecies of oncomelania hupensis were exposed to experimental infections with a strain of schistosoma japonicum from the lindu valley, central sulawesi, indonesia. all laboratory animals given 50 cercariae were suspecptible to infection with the greatest number of worms being found in mice followed by wistar rats, long evans rats, mongolian gerbils, wild rats, hamsters and guinea pigs. rabbits and the taiwan monkeys given larger numbers of cercariae were also susceptible ... | 1976 | 1030835 |
| some aspects on the ecology and biology of oncomelania hupensis lindoensis. | schistosomiasis is known to be endemic in the lake lindu area since 1937 (brug & tesch, 1937). investigations carried out later between 1940 and 1942 (bone et al., 1942) failed to find molluscan intermediate host. it was not until april 1971 that the first specimen of oncomelania was found (carney et al., 1972). in august of the same year the first focus was discovered at paku (hadidjaja et al., 1974). further investigations revealed 50 more foci in the lowlands surrounding the lake. a survey of ... | 1976 | 1030836 |
| malic dehydrogenase patterns in different strains of schistosoma japonicum and subspecies of oncomelania hupensis. | malic dehydrogenase (mdh) of the formosan philippine and indonesian strains of schistosoma japonicum and 3 subspecies of snails, oncomelania hupensis formosana, o. h. quadrasi, and o. h. lindoensis were identified by disc electrophoresis with 10.5% acrylamide gel columns using tris-malic buffer. male worm extracts of s. japonicum demonstrated 3, 2, and 2 clear mdh patterns and female worm extracts showed patterns of 2, 1 and 1 for the formosan, philippine and indonesian strains of the parasite, ... | 1976 | 1037537 |
| distribution of oncomelania hupensis in the napu valley of central sulawesi, indonesia. | fifteen colonies of oncomelania hupensis were found near trails transecting the north lore district, napu valley, central sulawesi. habitats were in abandoned rice fields, uncultivated grazing areas for livestock, roadside ditches and, in one case, an actively worked rice field. marsh grasses, ischaemum barbatum and laersia hexandra, were the most common plants in oncomelanid habitats. other mollusks found in association with o. hupensis were radix sp., melanoides sp., gyraulus sp., idiopoma sp. ... | 1975 | 1166348 |
| parasitological studies at a new breeding area of oncomelania hupensis chiui in taipei county, taiwan. | oncomelania hupensis chiui was found at the jui-ping area, linkow district, taipei county, taiwan, which is located on the north coast of the island approximately 10 km of the mouth of the tamasui river. the habitat of the snails at this area is similar to the type locality at alilao, on the slope of the hills along of coast. the snails from this new breeding area, are similar to the alilao snails, and are highly susceptible to the infection with geographic strains of schistosoma japonicum inclu ... | 1975 | 1243115 |
| [further observation on the ultrastructure of the sporocyst of schistosoma japonicum]. | a further observation was conducted on the ultrastructure of mother sporocyst (ms) daughter sporocyst in the brood chamber (b-ds), migrating daughter sporocyst (mi-ds) and daughter sporocyst in the liver tissue (1-ds) of oncomelania hupensis by scanning and transmission electron microscopy. there are 5 points worthy of mention here, namely: 1. a special structure, microvilli polymerizing cisterna, is found on the tegument of 52-day-old ms branche in all directions and a tubule-like structure is ... | 1992 | 1303341 |
| [studies on antigenic homology between schistosoma japonicum and oncomelania hupensis hupensis by indirect immunoperoxidase technique]. | adult schistosoma japonicum worms and oncomelania hupensis hupensis tissue sections were employed as antigens in the studies of anti-o. h. hupensis rabbit serum and anti-s. japonicum adult worm rabbit serum by indirect immunoperoxidase assay. the result indicated that the most prominent peroxidase reaction was presented in the adult worm sections and the head-foot and liver sections of o. h. hupensis. these suggested the possible presence of antigenic homology between schistosoma japonicum and o ... | 1992 | 1382886 |
| assessment of the molluscicidal activities of tribromosalan, cartap and chlorothalonil against oncomelania hupensis. | molluscicidal activities of tribromosalan, cartap and chlorothalonil were evaluated in the laboratory and the field against oncomelania hupensis, the intermediate host of schistosoma japonicum in china. the three chemicals were very effective against o. hupensis in the laboratory. the molluscicidal activities found in the field trials suggest that tribromosalan and cartap may be used as practical molluscicides. dosage of 10 g/m2 of tribromosalan in spring only and 20 g/m2 of cartap in both sprin ... | 1992 | 1434068 |
| miracidia of schistosoma japonicum: approach and attachment to the snail host. | schistosoma japonicum miracidia swim directed along a chemical gradient toward the snails oncomelania hupensis and biomphalaria glabrata, and they turn back when the concentration of attractive chemicals decreases. the host signal for this chemotactic response has a molecular weight of more than 30,000. when swimming miracidia encounter the surface of o. hupensis or agar containing o. hupensis snail-conditioned water (scw) they perform the host-specific responses "contact with return," "repeated ... | 1991 | 1865256 |
| [demonstration of replication of daughter sporocysts in the natural development of schistosoma japonicum]. | the participation of replicating sporocysts in the intramolluscal development of schistosoma japonicum within its snail host oncomelania hupensis is demonstrated by histological studies. replicating sporocysts were observed in snails maintained under both standard and hibernation conditions. the demographic and epidemiological importance of the replication process within schistosomes is discussed comparatively. | 1991 | 1904296 |
| penetration and migration routes of schistosoma japonicum miracidia in the snail oncomelania hupensis. | the routes of penetration and the strategies of invasion of schistosoma japonicum miracidia in the snail vector oncomelania hupensis were observed in a histological study. in all species of the genus schistosoma, it is usually assumed that the miracidia achieve penetration through the tegument. our results showed that at least 57% of s. japonicum miracidia penetrated the snail by natural openings (branchial cavity, mouth and rectum). throughout the invasion phase, the larvae were observed in all ... | 1991 | 1945527 |
| compatibility between oncomelania hupensis and different isolates of schistosoma japonicum in china. | oncomelania hupensis from six localities were used for infection with different isolates of schistosoma japonicum in the mainland of china, ie anhui in the east, hubei in the center, guangxi in the south, sichuan in the west, yunnan in the southwest and fujian in the southeast. snails from anhui and hubei were readily infected with the local isolate of s. japonicum and cross infection also took place readily between the snails and the schistosomes from these two places. snails from sichuan and y ... | 1991 | 1948286 |
| [studies on the strain differences of schistosoma japonicum in the mainland of china. ii. susceptibility of mammalian hosts]. | six species of animals were percutaneously exposed to cercariae obtained from pools of naturally infected snails from different isolates of s. japonicum in the mainland of china as shown in tables 1 and 2. our results indicated that with the exception of rat, all animals under study were permissive host though their worm recovery rates varied with different isolates. the mean prepatent period in different host species were 35.0 +/- 0.8 to 36.4 +/- 1.0 days for anhui isolate; 34.5 +/- 1.2 to 36.4 ... | 1990 | 2099256 |
| [studies on the strain differences of schistosoma japonicum in the mainland of china. i. compatibility between schistosomes and their snail hosts]. | oncomelania hupensis hupensis from six localities were used in this study, i.e. guichi of anhui in the east, jianli of hubei in the middle, guiping of guangxi in the south, tianquan of sichuan and eryuan of yunnan in the southwest and fuqing of fujian in the southeast. snails from each locality were individually cross-exposed to 20 miracidia of the different isolates of s. japonicum from the above-named places, with the exception of fujian province where no snail could be found naturally infecte ... | 1990 | 2208632 |
| failure to induce resistance of schistosoma japonicum to praziquantel. | in order to explore the possible occurrence of inducing resistance of schistosoma japonicum to praziquantel (pzq), a set of animal experiments were carried out. outbred mice (nih strain), anhui isolates of s. japonicum and oncomelania hupensis were used. in one protocol five weeks after being infected with 48-52 cercariae, mice were orally dosed with pzq 300 mg/kg, and killed 82 days later to isolate eggs from the liver. snails were exposed to miracidia released from egg-hatching. f1 progeny wer ... | 1990 | 2402679 |
| induction of resistance in oncomelania hupensis nosophora against schistosoma japonicum, but not against paragonimus ohirai, using irradiated miracidia. | oncomelania hupensis nosophora snails sensitized with x-irradiated schistosoma japonicum miracidia demonstrated resistance against a following challenge infection with non-irradiated homologous miracidia. the resistance in o. h. nosophora against s. japonicum was acquired within 1 day of sensitization, and it was strongest in a group challenged at an interval of 3 days. the resistance persisted for at least 4 weeks. histological examinations revealed amoebocyte accumulation around the challenged ... | 1989 | 2592137 |
| laboratory and field assessment of molluscicidal activity of b-2 against oncomelania hupensis, the vector snail of schistosomiasis in china. | molluscicidal activity of b-2 (sodium 2,5-dichloro-4-bromophenol; called as phebrol and registered in who as oms 3012) was evaluated in a laboratory and the field trials were performed in two different localities in yueyang city, china, for control of oncomelania hupensis. b-2 was effective against o. hupensis both in the laboratory and in the field. a dosage of 50 g/m2 in 10% granular form or 20 ml/m2 in 25% liquid form of b-2 would be recommendable as a standard mollusciciding dose for control ... | 1988 | 3193633 |
| differential susceptibility of male and female oncomelania hupensis quadrasi infected with schistosoma japonicum. | | 1987 | 3429119 |
| the simple laboratory maintenance of a highly productive schistosoma japonicum life cycle. | the maintenance and infection of oncomelania hupensis hupensis, the intermediate host of the chinese strain of schistosoma japonicum, is described. 60% of the snails exposed to miracidia became patent, and 5000 patent snails can be produced which yield over 250,000 cercariae per week. the maintenance and infection of snails require less than 8 man-hours per week. | 1987 | 3445324 |
| [shedding pattern of schistosoma japonicum cercariae from mainland china by oncomelania hupensis]. | the release of schistosoma japonicum cercariae from the people's republic of china shedded by oncomelania hupensis was observed hourly under laboratory conditions: ld 9 - 15, t degrees = 25 degrees c. daily periodicity of emergence was recognized during the light period. peaks emergence occurs between 2 and 5 p.m. results are compared with other geographical strains of s. japonicum. | 1986 | 3813433 |
| [study of schistosome-mollusk vector compatibility by the technic of microsurgical transplantation of sporocysts in two schistosoma japonicum-oncomelania hupensis combinations originating in mainland china]. | the schistosoma-mollusc compatibility was tested in two schistosoma japonicum-oncomelania hupensis combinations originated from mainland china. the first combination is a combination maintained for more than 30 years in laboratory, the second consisted of a laboratory strain of s. japonicum and a strain of o. h. hupensis taken in the field (jiangxi province). the fully absence of sporocyst throwing out and hemocyte infiltration 24 h. after transplantation suggest a perfect compatibility of the t ... | 1986 | 3813434 |
| ultrastructure of the daughter sporocyst and developing cercaria of schistosoma japonicum in experimentally infected snails, oncomelania hupensis hupensis. | ultrastructure of daughter sporocysts and cercariae of schistosoma japonicum were studied 2 and 4 months after infection of oncomelania hupensis hupensis. the body walls of daughter sporocysts are similar at all infectious stages. they consist of an external syncytial tegument on a basement membrane, and an internal cellular subtegument surrounding a body cavity containing developing cercariae. the cercariae embryos develop 2 months after infection from germinal balls in the brood chamber of the ... | 1985 | 3993185 |
| transplantation of schistosoma japonicum daughter sporocysts in oncomelania hupensis. | schistosoma japonicum daughter sporocysts obtained from infected oncomelania hupensis hupensis were successfully transplanted to parasite-free o. hupensis hupensis. survival and infection rates of recipient snails were 80% and 75% respectively. intramolluscan development of transplanted daughter sporocysts in recipient snails appears to proceed in a similar manner as those reported for transplanted s. mansoni and s. haematobium in their respective snail intermediate hosts. complete colonization ... | 1985 | 3998962 |
| tolerance of oncomelania hupensis quadrasi to varying concentrations of dissolved oxygen and organic pollution. | ecological investigations were made of habitats containing natural populations of the snail oncomelania hupensis quadrasi and of habitats free from the snail in the island of leyte, philippines. this species of snail is a vector of schistosoma japonicum in the philippines. snail-infested habitats had dissolved oxygen levels of 3.8-9.85 ppm but snail-free habitats had levels of only 0.08-3.6 ppm. snail-infested habitats were less polluted by organic matter than habitats that were snail-free. larg ... | 1972 | 4538906 |
| susceptibility of the ilan race of oncomelania hupensis formosana to the anthropophilic philippine strain of schistosoma japonicum. | | 1972 | 4641893 |
| oncomelania hupensis from the schistosomiasis focus in central sulawesi (celebes), indonesia. | | 1973 | 4687499 |
| susceptibility of previously resistant oncomelania hupensis formosana to re-exposure with schistosoma japonicum. | | 1973 | 4732037 |
| cercaria production of geographic strains of schistosoma japonicum in oncomelania hupensis chiui. | | 1968 | 5259182 |
| susceptibility of oncomelania hupensis subspecies to infection with geographic strains of schistosoma japonicum. | subspecies of oncomelania hupensis were exposed to infection with zoophilic and anthropophilic strains of schistosoma japonicum. the snails were philippine o. h. quadrasi from the islands of bohol, leyte and mindanao, o. h. formosana from changhua and ilan, and o. h. chiui from taiwan, o. h. hupensis from china, o. h. nosophora from japan and o. h. lindoensis from indonesia. anthropophilic strains of s. japonicum were from bohol and leyte in the philippines, china, japan and indonesia. the zooph ... | 1984 | 6505785 |
| epidemiology and control of schistosomiasis in southeast asia. | schistosomiasis in southeast asia, caused by schistosoma japonicum, schistosoma mekongi and schistosoma japonicum-like, have been reported from six different countries. the s. japonicum infections are highly prevalent in the philippines with oncomelania hupensis quadrasi as the vector snail, and in localized areas in indonesia with o.h. lindoensis as the snail vector. the s. mekongi infections are recent discovery in the lower mekong basin in laos and kampuchea, with tricula aperta as the vector ... | 1984 | 6535256 |
| susceptibility of snail vectors to oriental anthropophilic schistosoma. | laboratory experiments were carried out to study the susceptibility of snail vectors to oriental anthropophilic schistosoma. oncomelania hupensis hupensis was readily infected with the local strain of schistosoma japonicum (chinese strain), and also infected with s. japonicum (philippines strain). o.h. quadrasi was only susceptible to its s. japonicum (philippines strain). the oncomelania races were refractory to s. mekongi, s. japonicum-like species (malaysian strain). tricula aperta (beta race ... | 1984 | 6740384 |
| further studies on the susceptibility of new taiwan foci of oncomelania hupensis to geographic strains of schistosoma japonicum. | two known colonies of o.h chiui in alilao and of o.h. formosana in changhua and four new foci of snails in nantou, chiayi, hualien and taitung on taiwan were exposed each to 5 miracidia of changhua zoophilic strain and chinese, philippine and indonesian anthropopilic or human strains of s. japonicum. the results showed that all four new foci demonstrated various degrees of susceptibility to this parasite. infectivity of chinese strain of s. japonicum in 4 new foci of snails is reported for the f ... | 1982 | 7112218 |
| [development of schistosoma japonicum in the intermediate host oncomelania hupensis hupensis snail]. | | 1982 | 7126136 |
| studies on the susceptibility of new taiwan foci of oncomelania hupensis to ilan and japanese strains of schistosoma japonicum. | sixty snails from four new foci of o. hupensis in taitung, chiayi, hualien and nantou counties, and 4 known colonies of o. h. chiui in alilao and pali in taipei as well as of o. h. formosana in changhua and ilan on taiwan were exposed each to 5 miracidia of ilan zoophilic strain and japanese anthropophilic or human strain of s. japonicum. this is the first report to note that all four new foci of o. hupensis snails were highly susceptible to ilan strain of s. japonicum (17-20%). susceptibility t ... | 1982 | 7170640 |
| susceptibility of oncomelania hupensis formosana recombinants and hybrids with oncomelania hupensis nosophora to infection with schistosoma japonicum. | | 1981 | 7309340 |
| susceptibility of new taiwan foci of oncomelania hupensis to geographic strains of schistosoma japonicum. | six new recently identified taiwan oncomelania hupensis foci were exposed to miracidia from the changhua taiwan zoophilic and indonesian and philippine anthropophilic strains of schistosoma japonicum. all new foci were found susceptible to infection in varying degrees. in general the new foci were more susceptible to the changhua zoophilic strain of s. japonicum than the anthropophilic strains; 17% exposed to the zoophilic strain shed cercariae while 9% and 7%, respectively, of those exposed to ... | 1980 | 7444579 |
| schistosoma japonicum, zoophilic strain, in oncomelania hupensis chiui and o. h. formosana: miracidial penetration and comparative histology. | miracidial penetration and intramolluscan development of a zoophilic strain of schistosoma japonicum were studied in the highly susceptible oncomelania hupensis chiui and a highly resistant population of oncomelania hupensis formosana. when exposed to 20 miracidia, an average of 3.6 miracidia penetrated o. h. chiui and 3.4 penetrated o. h. formosana. the distribution of sporocysts in the 2 snail subspecies was similar: 70.4% migrated to the cephalopedal sinus, 14.2% to the anterior viscera, and ... | 1995 | 7472860 |
| [analysis of electrophoretic patterns of three enzymes of oncomelania hupensis]. | allozyme electrophoresis was carried out in starch gel to compare the electrophoretic patterns for acid phosphatase (acp, ec 3. 1. 3.2), peroxidase (po, ec 1.11.1.7) and esterase (est, ec 3. 1. 1. 1). it was found in this study that isoenzymes acp1, acp2 and po1, po2 were coded by 2 loci respectively and they were monomorphic. it is possible to determine 4 loci responsible for esterase zymogram, among which isoenzyme est3 region either consisted of a fast (est3-f) band in the case of oncomelania ... | 1994 | 7720201 |
| genetic variation in geographically isolated populations and subspecies of oncomelania hupensis determined by a pcr-based rflp method. | previously, the species complex oncomelania hupensis, individuals of which act as intermediate hosts for the human bloodfluke schistosoma japonicum, has been characterised by morphological and isoenzyme criteria. we have examined genetic variation between and within three subspecies of oncomelania hupensis, i.e. o. h. hupensis (china), o. h. quadrasi (philippines) and o. h. nosophora (japan), by direct means using a pcr-based rflp method. the subspecies of o. hupensis were readily distinguished ... | 1994 | 7942357 |
| [morphology and phagocytic activity of hemocytes of oncomelania hupensis]. | hemocytes from oncomelania hupensis hemolymph were studied in vitro. spreading amoebocytes were the most common cell type. the average sizes of amoebocytes from anhui and yunnan were 8.42 +/- 0.73 x 7.46 +/- 0.52 microns and 7.63 +/- 0.65 x 6.85 +/- 0.54 microns, respectively. the nucleus was round in shape, and eosinophile granular inclusions were found in the endocytoplasm. contacting with slide, the cells became flattened with extending pseudopodia. the ability of amoebocytes from snails of b ... | 1994 | 7955155 |
| parthenogenesis in the genus schistosoma: electrophoretic evidence for this reproduction system in s. japonicum and s. mansoni. | mixed infections with schistosoma japonicum and s. mansoni were carried out in mice. s. japonicum females paired with s. mansoni males developed normally and produced numerous viable eggs; very little sperm was found in the female genital tract. the eggs yielded many miracidia infective to oncomelania hupensis, the host of s. japonicum. cercariae arising from miracidia developed into male worms with an electrophoretic pattern of malate dehydrogenase (mdh) corresponding only to the maternal speci ... | 1994 | 8036230 |
| experimental infection of five subspecies of oncomelania snails with angiostrongylus cantonensis. | five subspecies of oncomelania snails, oncomelania hupensis nosophora, o.h. hupensis, o.h.chiui, o.h.formosana and o.h.quadrasi, were experimentally exposed to the first stage larvae of angiostrongylus cantonesis. the presence of third stage larvae was observed in all of the five subspecies of oncomelania snails 20 days after infection. infection rates of the third stage larvae of the parasite in oncomelania snails were 38.0-40.0%. there were no differences in preferences among oncomelania snail ... | 1995 | 9139392 |
| allozyme variation among six populations of the freshwater-snail oncomelania hupensis in zhejiang, china. | thirteen enzymes encoded by 16 loci of six population of oncomelania hupensis in zhejiang, china, were investigated by means of starch gel electrophoresis. ten loci (ao, 6pgd, me, akp, oct-1, hbdh-1, hbdh-2, xdh, mdh and mpi) were monomorphic and 6 loci (oct-2, pgi, aat, pgm-1, pgm-2 and acp) were polymorphic. three enzymes (oct, hbdh and pgm) were encoded by 2 loci. the results indicated that there were allozyme variations in two subspecies, o.h. hupensis and o.h. fausti in zhejiang, china. nei ... | 1996 | 9280011 |
| in vivo labeling of schistosoma japonicum cercariae with 35s. | a technique was developed for in vivo labeling of adult schistosoma japonicum worms using 35s bound to methionine and cysteine. the isotope was applied in an in vivo labeling system in which oncomelania hupensis snails harboring a patent s. japonicum were individually exposed to the label. following exposure to cercariae, mice were perfused after 6 wk. for autoradiography and fluorography, the worms were mounted on cardboard, covered with x-ray films, and exposed for 5 wk. with both techniques, ... | 1997 | 9379308 |
| the population dynamics of cercariae of schistosoma japonicum in oncomelania hupensis. | the population dynamics and production of cercariae of schistosoma japonicum in oncomelania hupensis are reported. the experiments covered the whole life span of positive snails and different intervals of cercariae shedding. the results indicated that two patterns of the dynamics of cercariae shedding had been found in the life span of positive snails. the first was a long-time interval (4-7 days) and progressive decline pattern. the cercariae shedding of positive snails lasted 18-19 weeks in ma ... | 1997 | 9444009 |
| anthraquinones in rheum palmatum and rumex dentatus (polygonaceae), and phorbol esters in jatropha curcas (euphorbiaceae) with molluscicidal activity against the schistosome vector snails oncomelania, biomphalaria and bulinus. | hot water extracts of rheum plamatum and rheum dentatus (from china) showed molluscicidal activity against the snails oncomelania hupensis, biomphalaria glabrata and bulinus globosus, which are vectors of schistosoma japonicum, s. mansoni and s. haematobium, respectively. activity was correlated with antraquinones which were identified by hplc: rhein and chrysophanol-anthron were most active (> 50% dead snails after 2 days in a 0.03% solution). molluscicidal activity was intermediate with rheum- ... | 1997 | 9472303 |
| observation of developing cercaria of schistosoma japonicum on ultrastructural level and remarks at its morphology of mature stage. | to study the developing cercaria of schistosoma japonicum (s. japonicum) on ultrastructural level by transmission electron microscope (tem) for analyzing the morphological dynamic changes of the tegument, glands and musculature. | 1997 | 9642314 |
| epidemiology of schistosoma japonicum in china: morbidity and strategies for control in the dongting lake region. | dongting lake, covering a very large surface water area of 2691km(2), is located in hunan province in the southern part of the people's republic of china. it is the second-largest freshwater lake in china and plays an important role in regulating the amount of water in the yangtze river, china's longest river. the annual water level of the lake changes by as much as 15m, rising in summer and falling in winter. asian schistosomiasis has been endemic in the dongting lake region for centuries and i ... | 2000 | 10719120 |
| schistosoma japonicum in the black rat, rattus rattus mindanensis, from leyte, philippines in relation to oncomelania snail colonies with reference to other endoparasites. | this study examined the prevalence of schistosoma japonicum infections in field rats, rattus rattus mindanensis, according to different trapping locations. between october 1995 and january 1996, traps were set in the municipality of palo, leyte, philippines to determine the correlation of rats infected with schistosomiasis to the proximity of the intermediate snail host, oncomelania hupensis quadrasi, colonies. of the 22 rats that were caught within a snail colony, 21 (95.5%) were positive for s ... | 1999 | 10774707 |
| an observation on the mimic ecology of the oncomelania hupensis in three-gorge-reservoir areas. | according to the modulation of three-gorge-reservoir water level, the two observation spots were established at gaoyang town and jianshe village in xingshan county of hubei province in order to observe the survival and reproduction of the oncomelania under different ecological conditions. our one-year observation revealed that most settled oncomelania died between june and august in the year and only a few of them survived the winter. the oncomelania hupensis's survival rate in group i, ii, iii ... | 1998 | 10806825 |
| measuring exposure to schistosoma japonicum in china. iii. activity diaries, snail and human infection, transmission ecology and options for control. | we used activity diaries and snail detection to relate water contact and schistosoma japonicum infection among a cohort of 178 residents on two islands in the dongting lake, china. water exposure to each of 12 mapped water zones around the islands was calculated (m(2) min/day) for each subject. infected oncomelania hupensis hupensis snails in this area are focal and were found in only five of the 12 zones, with the highest rate being 5.7%. thirty-one subjects (17%) were re-infected with a mean i ... | 2000 | 10838211 |
| possible effects of the three gorges dam on the transmission of schistosoma japonicum on the jiang han plain, china. | the three gorges dam, under construction on the yangtze river in china, might affect the transmission of schistosoma japonicum on the jiang han plain, which is downstream of the dam. to study this possibility, the prevalence of schistosomiasis was investigated in relation to a range of malacological, hydrological and meteorological factors. the general water level in the yangzte over a year had a marked effect on the distribution of the intermediate host (oncomelania hupensis) and the prevalence ... | 2000 | 10945043 |
| oncomelania hupensis (gastropoda: rissooidea) in eastern china: molecular phylogeny, population structure, and ecology. | the rissooidean snail genus oncomelania is of medical interest as various taxa are hosts for the human blood fluke schistosoma and the lung fluke paragonimus; because of close co-evolved host-parasite-relationships, snail diversity may reflect parasite diversity. there is a considerable amount of confusion regarding the identity of smooth- and ribbed-shelled populations of oncomelania hupensis in eastern china. we therefore studied the genetic variation, population structure, phylogenetic relati ... | 2000 | 11080513 |
| a protocol for geographically randomized snail surveys in schistosomiasis fieldwork using the global positioning system. | a protocol was created for performing geographically randomized snail surveys for schistosomiasis research using the global positioning system (gps). this protocol differs from traditional surveys in its ability to accurately map and measure the spatial distribution of snail habitat. the protocol was used to map irrigation ditches, the primary habitat for oncomelania hupensis, in two residence areas in sichuan province, china. from the 7,450 meters of mapped ditches, snail surveys were performed ... | 2001 | 11425171 |
| relationship between the transmission of schistosomiasis japonica and the construction of the three gorge reservoir. | to study the relationship between the changes of environment and the transmission of schistosomiasis japonica after the construction of the three gorge reservoir. | 2002 | 12020887 |
| [immunization of mice with native tropomyosins from schistosoma japonicum and oncomelania hupensis]. | to study the protection against cercariae challenge in mice immunized with native tropomyosin (tm) antigens from schistosoma japonicum (chinese strain) and oncomelania hupensis. | 1998 | 12078282 |
| [sensitivity of oncomelania snail to niclosamide in china]. | to understand the variation in response of oncomelania hupensis to niclosamide. | 2002 | 12567571 |
| [preliminary study on cytochrome c oxidase 1 gene of oncomelania hupensis from miao river area in hubei province]. | to study the mitochondrial cytochrome c oxidase 1(co1) gene of oncomelania snails from miao river area in hubei province. | 2001 | 12572023 |
| studies on antagonism between exorchis ovariolobularis and schistosoma japonicum in oncomelania hupensis. | to examine the antagonistic interactions between schistosoma japonicum and exorchis ovariolobularis in the snail host, oncomelania hupensis. | 2001 | 12572041 |
| [establishment of minimum medical geographic information systems database in china]. | to establish a minimum medical geographic information systems (gis) database as a spatial decision supporting system (sdss), and to use the database into public health practice in china. | 2003 | 12820938 |
| the molluscicidal effect of sodium pentachlorophanate and calcium arsenite on oncomelania hupensis, a snail host of schistosoma japonicum in china. | | 1958 | 13587057 |
| infectivity of the philippine strain of schistosoma japonicum in oncomelania hupensis, o. formosana and o. nosophora. | | 1960 | 13716382 |
| [initial temperature for the development of schistosoma japonicum larvae in oncomelania hupensis]. | to study the impact of environmental temperature on the development of schistosoma japonicum larvae within the oncomelania hupensis. | 2003 | 15108528 |
| [immunolocalization of the signaling protein 14-3-3 of schistosoma japonicum]. | to study the localization of the signaling protein 14-3-3 of schistosoma japonicum (sj14-3-3) in the parasite. | 2003 | 15108541 |
| [prediction of the spatial distribution of oncomelania snails in marshland of jiangning county using the ordinary kriging]. | to explore the methods to predict the distribution of oncomelania hupensis in the marshland of jiangning county. | 2004 | 15597715 |
| a potential impact of climate change and water resource development on the transmission of schistosoma japonicum in china. | there is growing consensus among climate modellers that the unusual global warming observed in the last decades of the 20th century is primarily forced by human activities, namely greenhouse gas increases in the atmosphere. global warming will trigger alterations in physical and biological systems, including shifts in the spatio-temporal distribution of disease vectors, but the nature and extent of these changes are poorly understood. the purpose of the present study was to assess the potential ... | 2005 | 16044681 |
| a review of geographic information system and remote sensing with applications to the epidemiology and control of schistosomiasis in china. | geographic information system (gis) and remote sensing (rs) technologies offer new opportunities for rapid assessment of endemic areas, provision of reliable estimates of populations at risk, prediction of disease distributions in areas that lack baseline data and are difficult to access, and guidance of intervention strategies, so that scarce resources can be allocated in a cost-effective manner. here, we focus on the epidemiology and control of schistosomiasis in china and review gis and rs ap ... | 2005 | 16112638 |
| a geographic information and remote sensing based model for prediction of oncomelania hupensis habitats in the poyang lake area, china. | a model was developed using remote sensing and geographic information system technologies for habitat identification of oncomelania hupensis, the intermediate host snail of schistosoma japonicum, in the poyang lake area, china. in a first step, two multi-temporal landsat tm 5 satellite images, one from the wet and the second from the dry season, were visually classified into different land-use types. next, the normalized difference vegetation index was extracted from the images and the tasseled- ... | 2005 | 16140246 |
| remote sensing and spatial statistical analysis to predict the distribution of oncomelania hupensis in the marshlands of china. | remote sensing and spatial statistical analysis were employed to predict the distribution of oncomelania hupensis, the intermediate host snail of schistosoma japonicum, in the marshlands of jiangning county in china. surrogate indices related to environmental factors in the marshlands were derived from a landsat 7 etm+ image, and the relationship between environmental covariates and the density of o. hupensis was analyzed by stepwise regression models and ordinary kriging. although stepwise regr ... | 2005 | 16150415 |
| development of a vaccine against schistosoma japonicum in china: a review. | significant progress has been made over the past 50 years in the control of schistosomiasis japonica in china. however, recent data suggest that the disease is re-emerging. by the end of 2003, schistosoma japonicum was still endemic in 110 counties in seven provinces in the southern part of china where the long-term reduction of the disease has been replaced by an increase in the number of people infected and areas infested by the intermediate host snail, i.e. oncomelania hupensis. explanations ... | 2005 | 16168945 |
| development of a novel pcr assay capable of detecting a single schistosoma japonicum cercaria recovered from oncomelania hupensis. | location and time-specific variability in schistosoma japonicum cercarial density has been shown to be high in the mountainous regions of sichuan province, china. a polymerase chain reaction (pcr) assay for the detection of schistosome cercariae in these environments would aid in the determination of environmental risk, and the identification of individual-level risk factors. here the authors present a highly sensitive and specific pcr assay for the detection of s. japonicum cercariae in laborat ... | 2005 | 16174414 |
| [analysis of genetic diversity of aflp marker among populations of oncomelania hupensis]. | to explore the degree of genetic diversity among populations of oncomelania hupensis. | 2006 | 16866138 |
| effect of temperature on the development of schistosoma japonicum within oncomelania hupensis, and hibernation of o. hupensis. | the objectives of this investigation were to assess the effect of temperature on the development of schistosoma japonicum harboured in oncomelania hupensis and to determine the lowest temperature threshold at which the hibernation of o. hupensis occurs. in the first experiment, adult infection-free o. hupensis, collected from jiangsu province in eastern china, were infected with s. japonicum miracidia and raised at different temperatures under laboratory conditions. the development of miracidia ... | 2007 | 17031698 |
| identification of the boudicca and sinbad retrotransposons in the genome of the human blood fluke schistosoma haematobium. | schistosomes have a comparatively large genome, estimated for schistosoma mansoni to be about 270 megabase pairs (haploid genome). recent findings have shown that mobile genetic elements constitute significant proportions of the genomes of s. mansoni and s. japonicum. much less information is available on the genome of the third major human schistosome, s. haematobium. in order to investigate the possible evolutionary origins of the s. mansoni long terminal repeat retrotransposons boudicca and s ... | 2006 | 17072464 |
| [development of a pcr assay for detecting schistosoma japonicum-infected oncomelania hupensis]. | to establish a sensitive and specific pcr assay for detecting schistosoma japonicum-infected oncomelania hupensis. | 2006 | 17094624 |
| [a study on the effect of oncomelania hupensis hupensiss killed with niclosamide in china]. | to study the effect of oncomelania hupensis hupensis of niclosamide, and exploring the main influencing factors. | 2006 | 17175588 |
| [study on the genetic diversity among populations of schistosome intermediate hosts within oncomelania hupensis (gastropoda: rissooidea) in mainland china]. | to explore the genetic diversity among populations of oncomelania hupensis. | 2006 | 17343180 |
| [studies on haemocytes of oncomelania hupensis]. | to establish method for collecting haemocytes of oncomelania hupensis and study its morphology and immunological importance. | 2007 | 17633827 |
| a model for the prediction of oncomelania hupensis in the lake and marshland regions, china. | a model has been developed for predicting the density of oncomelania hupensis, the intermediate host snail of schistosoma japonicum. the model takes into account different environmental factors, including elevation, air and soil temperature, type of vegetation, mean height of preponderant vegetation and soil humidity. deviance and akaike information criteria were used to determine the best model fits. model diagnostics and internal and external validations of model efficiency were also performed ... | 2008 | 18187358 |
| potential impact of climate change on schistosomiasis transmission in china. | appraisal of the present and future impact of climate change and climate variability on the transmission of infectious diseases is a complex but pressing public health issue. we developed a biology-driven model to assess the potential impact of rising temperature on the transmission of schistosomiasis in china. we found a temperature threshold of 15.4 degrees c for development of schistosoma japonicum within the intermediate host snail (i.e., oncomelania hupensis), and a temperature of 5.8 degre ... | 2008 | 18256410 |
| an integrated approach to identify distribution of oncomelania hupensis, the intermediate host of schistosoma japonicum, in a mountainous region in china. | the aim of this study is to better understand ecological variability related to the distribution of oncomelania hupensis, the snail intermediate host of schistosoma japonicum, and predict the spatial distribution of o. hupensis at the local scale in order to develop a more effective control strategy for schistosomiasis in the hilly and mountainous regions of china. a two-pronged approach was applied in this study consisting of a landscape pattern analysis complemented with bayesian spatial model ... | 2008 | 18294641 |
| effect of floods on the transmission of schistosomiasis in the yangtze river valley, people's republic of china. | the aim of the present study was to assess the effect of floods on the transmission of schistosomiasis in the yangtze river valley, people's republic of china. retrospective analyses of malacologic, clinical and epidemiologic data, covering a 22-year period, were carried out to elucidate the dispersal patterns of intermediate host snails (oncomelania hupensis), and acute and chronic infections with schistosoma japonicum in humans in relation to floods. potential o. hupensis habitats in years wit ... | 2008 | 18499513 |
| [spatial distribution pattern of oncomelania hupensis population in marshland and lake area]. | to explore the spatial pattern of the distribution of oncomelania hupensis population in marshland and lake region. | 2008 | 18637584 |
| remote sensing for predicting potential habitats of oncomelania hupensis in hongze, baima and gaoyou lakes in jiangsu province, china. | political and health sector reforms, along with demographic, environmental and socio-economic transformations in the face of global warming, could cause the re-emergence of schistosomiasis in areas where transmission has been successfully interrupted and its emergence in previously non-endemic areas in china. in the present study, we used geographic information systems and remote sensing techniques to predict potential habitats of oncomelania hupensis, the intermediate host snail of schistosoma ... | 2006 | 18686234 |
| generalized negative binomial distribution: a promising statistical distribution for oncomelania hupensis in the lake- and marsh-land regions of china. | a new generalization of the negative binomial distribution (gnbd) is introduced and fitted to counts of oncomelania hupensis, the intermediate host of schistosoma japonicum, made, in areas of chinese lakeland and marshland, early in the winter of 2005 and late in the spring of 2006. the gnbd was found to fit the snail data better than the standard negative binomial distribution (nbd) that has previously been widely used to model the distribution of o. hupensis. with two more parameters than the ... | 2008 | 18782493 |
| impact of changing water levels and weather on oncomelania hupensis hupensis populations, the snail host of schistosoma japonicum, downstream of the three gorges dam. | increasing evidence indicates that dams impact riverine ecosystems and human diseases. poyang lake, one of the largest schistosomiasis endemic environments in china, will change due to the construction of the yangtze river three gorges dam. we assess changes in oncomelania hupensis hupensis, the snail host for schistosoma japonicum, in response to changing water levels and weather from 1998 to 2002. in the 5 years following the major flooding of poyang lake in 1998, seasonal water levels have gr ... | 2008 | 18787918 |
| [spatial distribution and elimination of schistosome japonicum intermediate hosts oncomelania hupensis in mountainous regions]. | to explore the spatial distribution and elimination of oncomelania hupensis in mountainous regions. | 2008 | 19115617 |
| impact of the south-to-north water diversion project on the transmission of schistosoma japonicum in china. | the south-to-north water diversion project (snwdp) is currently the key, national, water-conservation project in china, designed to optimise the use of water resources and relieve the water shortages in the north of the country. as one of the main water intakes for the project, that of the eastern route scheme (ers), is a breeding site for oncomelania hupensis (the intermediate host of schistosoma japonicum), there is concern that the snail may be carried far to the north, in the water passing t ... | 2009 | 19173773 |
| [sequencing on products of oncomelania hupensis through simple sequence repeat anchored polymerase chain reaction amplification]. | to analyze the sequence of microsatellite and the flanking sequence from four populations of oncomelania hupensis. | 2008 | 19173938 |
| landscape genetics: the correlation of spatial and genetic distances of oncomelania hupensis, the intermediate host snail of schistosoma japonicum in mainland china. | two internal transcribed spacer (its1 and its2) sequences of the non-coding region of the rdna and a 16s rna gene fragment of the mtdna of oncomelania hupensis, the intermediate host snail of schistosoma japonicum in mainland china, have been investigated with a view to illustrate the influence of the environment on genetic differentiation. thirteen populations of o. hupensis snails, representing four types of ecological settings, were collected to compare genetic and spatial distances. the leng ... | 2009 | 19440964 |
| functional properties of hemocyanin from oncomelania hupensis, the intermediate host of schistosoma japonicum. | the gastropod mollusc, oncomelania hupensis is a unique intermediate host for the human parasite schistosoma japonicum. it is a primary factor for the epidemic of schistosomiasis and its distribution is consistent with the epidemic area of schistosomiasis. here we report the functional properties of hemocyanin of o. hupensis (ohh), a copper-containing respiratory protein which was isolated from its hemolymph and purified by ammonium sulfate fractionation and ultracentrifugation. we identified th ... | 2009 | 19654007 |
| development of larval schistosoma japonicum blocked in oncomelania hupensis by pre-infection with larval exorchis sp. | schistosomiasis continues to be a significant public health threat in the world. in the area of parasitic diseases, it is widely considered second only to malaria as a global health problem, with an incalculable drain on the economic resources of countries where it is endemic. schistosoma japonicum is widespread in eastern and southeastern asia, where the amphibious snail, oncomelania hupensis, is the intermediate host. in the present study, we found that infection of o. hupensis with the mature ... | 2009 | 19663532 |
| molluscicidal activity of the plant eupatorium adenophorum against oncomelania hupensis, the intermediate host snail of schistosoma japonicum. | the potential molluscicidal activities of aqueous extracts of eupatorium adenophorum have recently been evaluated against oncomelania hupensis, the intermediate host snail of schistosoma japonicum. the snails were continuously exposed to extracts of the leaves, roots or stems [each at concentrations of 0.27%, 0.50% and 0.86% (w/v)], with survival recorded 6, 12, 24, 30, 36, 48, 52, 58, 70, 76, 82 and 96 h after the start of the exposure. even at the lowest concentration tested (0.27%), the leaf ... | 2009 | 19695160 |
| landscape pattern analysis and bayesian modeling for predicting oncomelania hupensis distribution in eryuan county, people's republic of china. | detailed knowledge of how local landscape patterns influence the distribution of oncomelania hupensis, the intermediate host snail of schistosoma japonicum, might facilitate more effective schistosomiasis control. we selected 12 villages in a mountainous area of eryuan county, yunnan province, people's republic of china, and developed bayesian geostatistical models to explore heterogeneities of landscape composition in relation to distribution of o. hupensis. the best-fitting spatio-temporal mod ... | 2009 | 19706906 |
| [impact of climate warming on schistosomiasis transmission and application of relative research techniques]. | oncomelania hupensis is the intermediate host of schistosoma japonicum, and its distribution is consistent with that of schistosomiasis. temperature is an essential environmental factor for the survival of snails. therefore, it is important to study the impact of climate warming on snail-breeding and schistosomiasis transmission. this paper reviews the importance of climate warming to snail breeding and the spreading of the disease, and the application of relative research techniques. | 2009 | 19852373 |